Removed unused import

refs ec28478435

- I removed use of the `logging` variable in the last commit so we no
  longer need the library import
- this fixes a linting issue

core/server/notify.js

@@ -8,7 +8,6 @@
 
 // Required Ghost internals
 const config = require('../shared/config');
-const logging = require('@tryghost/logging');
 
 let notified = {
     started: false,